Certain chip version / board combinations have massive problems if
ASPM is active. If BIOS enables ASPM and doesn't let OS control it,
then we may have a problem with the current code. Therefore check the
return code of pci_disable_link_state() and don't enable ASPM in the
network chip if OS can't control ASPM.
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
drivers/net/ethernet/realtek/r8169_main.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 2e2a74aa0..48b8a90f7 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -652,6 +652,7 @@ struct rtl8169_private {
unsigned irq_enabled:1;
unsigned supports_gmii:1;
+ unsigned aspm_manageable:1;
dma_addr_t counters_phys_addr;
struct rtl8169_counters *counters;
struct rtl8169_tc_offsets tc_offset;
@@ -4286,7 +4287,8 @@ static void rtl_pcie_state_l2l3_disable(struct rtl8169_private *tp)
static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable)
{
- if (enable) {
+ /* Don't enable ASPM in the chip if OS can't control ASPM */
+ if (enable && tp->aspm_manageable) {
RTL_W8(tp, Config5, RTL_R8(tp, Config5) | ASPM_en);
RTL_W8(tp, Config2, RTL_R8(tp, Config2) | ClkReqEn);
} else {
@@ -6678,7 +6680,9 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
/* Disable ASPM completely as that cause random device stop working
* problems as well as full system hangs for some PCIe devices users.
*/
- pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
+ rc = pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
+ PCIE_LINK_STATE_L1);
+ tp->aspm_manageable = !rc;
/* enable device (incl. PCI PM wakeup and hotplug setup) */
rc = pcim_enable_device(pdev);
--
2.22.0
